Synopsis: For up to $600 a day, private security contractors in Iraq's war zone put their lives on the line to protect V.I.P.s and to transport critical supplies. Now, National Geographic travels alongside three teams on missions in the "kill zone" to reveal street rules of defense, tools for surviving ambushes and preparedness for the unexpected. Learn how specially designed vehicle armor and customized weapons help these mercenaries survive being targeted by insurgents.
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